Hoist



' H. A. cums.

- HOIST.

APPLICATION man M-AY 21, ms. RENEWED JULY 21,1920. 1,357,150, Patented Oct 26, 1920.

. 3 SHEETS-SHEET 1.

30 1/ i i i 4.?

v 4 10 J l 7 W (51 gnum H01,

6H0: nu,

H. A. curms.

HOIST. I APPLICATION FILED MAY 27, I918. RENEWED JULY 27,1920. I 1,357,150, I Patented Oct. 26, 1920.

. 3 $HEET$--SHEET 2.

Snow 1 50 0 H. A. CURTIS.

Patbnted Oct. 26, 1920.

3 SHEETS-SHEET 6111101 mzq ,UNITEDSTATES ATENT QFHQE.

HENRY A. CURTIS, 0F POMEROY, OHIO.

Application filed May 27, 1918.

I 0 aZZ whom it may concern I Be it known that I, HENRY A. CURTIS, a citlzen of the United States, residin at Pomeroy, in the county of Meigs and btate of Ohio, have invented new and useful Improvements in Hoists, of which the follow ing is a specification.

The invention is designed for the purpose of providing a hoisting derrick carrying an operative means mounted upon its mast for raising and lowering the boom and the rope gearing, and for shifting the mast angu larly.

A further purpose of the invention is to provide a derrick or hoist of this character in which the boom, the rope gearing and their attendant parts are operated and the derrick as a whole turned angularly with the center of the mast as a pivot, all of these operations being independent and the derrick being so designed that it may be made to perform all of these functions by a single attendant or operator.

A still further purpose seeks the provision of a hoist or derrick which is simple in construction, durable and efl'ective in operation, composed of a comparatively few parts, and inexpensive to manufacture.

Still further and other purposes will appear in the following detailed description.

The drawings illustrate and the specification describes a particular embodiment of the invention to which embodiment however, it is not to be restricted. The right is reserved to make such changes or alterations as the actual reduction to practice may suggest, in so far as such changes or alterations are comprehended in spirit by the annexed claims.

The same numerals of reference designate the same parts throughout the several figures of the drawings, wherein:

Figure 1 is a view in side elevation of the invention.

. Fig. 2 is a side elevational view looking at the side opposite from that shown in Fig. 1.

Fig. 3 is a front elevational view.

Fig. 4 is a detail view partly in elevation and partly in section of the reversing friction gear designed for the purpose of rotating the device on its base.

Fig. 5 is a detail sectional view showing a portion of the main base and the supplemental base with the means for turning the Specification of Letters Patent.

Serial No. 236,842. Renewed iruly 27, 1920. Serial No. 399,441.

latter and anti-friction means which pernnts it to be readily turned.

In the drawings, the invention is shown as comprising a mast 1, a boom 2, a sub-base 3 and a top base 4-, all the other parts associated with the invention being carried by one or the other of these parts The sub-base 3 is provided with an upstanding annular marginal rim 5 and the top or upper base 4- is surrounded by this marginal rim, a series of balls 6 being interposed between the two bases and held in circular raceways formed in each, so that the top base may readily turn on the sub-base within the marginal rim 5 of the latter. The rim 3 rises above the upper face of the top base 4, so that it may present on its inner circumference a width of face sufiicient to be frictionally engaged by a friction gear 7, the function of which is later described.

The mast 1 is rigidly attached at its bottom end to the upper base 4 at the center of the latter and, rising upwardly, the mast 1 receives adjacent its top a ring 8 which is slidingly held in a circumferential groove formed in the mast. At points ninety degrees apart on its periphery, the ring 8 carries eyes 9 with which there are connected the ends of guy ropes 10, the latter leading from the eyes to the ground where they are attached to suitable anchorages of any acceptable design.

At a suitable point above the upper base 4, the mast 1 carries a prime mover 11 which is preferably in the form of a gasolene e11 gine, the driving shaft 12 of which extends a sufficient distance from either side to permit the attachment thereto of pi-nions 13, either of which may be allowedto float on the shaft or secured against angular move ment thereon depending on whether the clutches lei are held in the operative or inop erative position, the clutches being appropriately carried on the shaft 12 and associated with the pinions 13 and operated by the levers 15 which are pivotally mounted on the outward bearing blocks of the engine shaft.

Outside the pinions 13, the engine 11 carries on its shaft the fly wheels 16, and on one side of the engine, the shaft 12 is extended beyond the fly wheel 16 to permit its receiving on its end, a bevel friction gear 17, the function of which is later described.

Supported jointly by the mast 1 and the upper base 4 there is an open frame 18', which acts as a supporting medium, for the drums 19 and 20, each of which is provided with a shaft journaled in" the sidesqof the. 5 frame 18. The shaft of the drum 19 extends beyond the frame while the shaft of the drum 20 extends beyond thereof. The drum 19 as well as the drum 20 is rotated by the engine 11, the former drum carrying on they extended end of'its shaft, a gear 21, which derives its motion from the pinion 13 carried by the shaft 12 on the same side of the mast, an idle pinion V 15 22 rotatably mounted on an appropriate stud carried by the frame 18 meshing with both the pinion 13 and with the gear 21.

The drum 20 is driven by the engine 11 because of its being providedwith a gear 23 carried on the extended end of its shaft which gear meshes with the remaining gear 13 mounted on the engine shaft 12. I

The boom 2, as is usual with derricks, is swingingly connected with the mast 1 near the point of connection of the latter with the top base 4, and at its outer or free end and on the upper side, the boom is provided with an appropriate eye 24 with which one end 'of a cable 25 is connected, this cable 25 being trained over a grooved pulley 26 mounted on the mast and being led from this pulley to the drum 19.

In adlition to the eye 24, the boom 2 is further provided with an eye 27, also carried near its free end, but on the under side of the boom. This eye 27 has connected to it, a pulley block 28 in conjunction with which, the block 29 and the cable 30 forms a rope gearing, the cable 30 being trained around the pulleys mounted in the two blocks, and then trained over a pulley 31 rotatably mounted on one side of the boom. Leaving the pulley 31, the cable 30 is trained over a pulley 32 mounted on themast 1, and from this latter pulley, it is then led to the drum 20 on which it is designed to be held. j

The block 29'is provided with a grapple 33, sothat an appropriate 'ri may be had on objects to be lifted by t e oist.

It is obvious that the rotation of the drum 19 will serve to raise the free end of the boom, for the cable 21 is wound around the drum when the latter is rotated in the proper direction, and this rotation is imparted to the drum 19 by the proper manipulation of that lever 15 which controls the clutch 14 of that pinion 13 driving the idle pinion 22 and the gear 21. The engine 11 is designed to rotate in the proper direction to effect thewinding of the cable 25 on the drum 19, thus raising the boom 2. When the boom is to be lowered, the lowering is effected by gravity, and in order that this lowering operation may be under control of 18 on one side thereof the said frame on the opposite side base 3', the ballso providing for freedom of the person. operating the derrick, there is provided a shaft 34 which is journaled in the frame 18 and carries the pinion 35 which meshes, with the gear 21. The shaft 34 also carries a friction wheel 36, the periphery of which may be engaged by the hand operated brake 37, the latter being pivotally mounted on the mast, andserving as a brake for the drum 19 when it is in contact with the friction wheel 36' as before described. V

The grapple 33 when provided with a load, is raised by the rotation of the drum 20, the rotation of this drum being obtained by operating the clutch 14 controlling that pinion 13 which drives the gear 23. The grapple 33, as is the boom, is with its load lowered by gravity, and in the lowering operation, is controlled by a hand operated brake 38 which is engage'able with the periphery of a friction wheel 39, the latter being carried on a shaft 40 journaled in the frame 18 in the same way as the shaft 34, this shaft 40 extending beyond the frame and receiving a gear 41 which meshes with the gear 23.

ft is apparent from the foregoing description how a load is raised and lowered by the boom 2 and the rope gearing, but the invention makes provision for turning the mast 1 angularly, so that the boom and its load may be moved between any two points within the radius of the boom. The top base 4 may be turned angularly on the submovement in this respect. This movement of thetop base 4 is derived from the engine 11. A vertically disposed shaft 42 is journaled in appropriate bearings one formed in the end of a laterallyprojecting arm 43 connected with the frame 18, and the other formed in a. laterally projecting arm 44 secured to the mast 1. The friction gear 7 previously referred to is carried by the shaft 42 at the lower end of the latter, and the ro- 1 tation of this shaft effects the rotation of the gear 7 whiclnrolling on the inner circumference of the rim 5, results in the movement of the top base 4 angularly on the sub-base 3, since, except for rotary movement, the position of the shaft 42 is fixed i with reference to the top base 4. The lower end of the shaft 42 is journaled in an appropriate bearing formed in the top base 4.

The shaft 42 may be rotated in either direction and for this purpose, there is provided a relatively long hub member 45 mounted on the shaft 42 and capable oflongitudinal movement therealong, but fixed against angular movement on the shaft. This hub 45 carries at either end, a bevel friction gear 46, either one of which may be made to engage the bevel friction gear 17 by movement of the hub member 45 longitudinally alongthe shaft 42. This movement of the hub member in either direction is accomplished by a shifter 47 which is operated by a hand lever 48, the latter being capable of rocking movement in its means of support on the arm 44.

A locking segment 49 is carried by the arm 44 so that it may be engaged by the latch 50 mounted on the lever 48. This segment is for the purpose of securing the lever 48 in any one of three positions where one or the other of the friction gears 46 may be held in engagement with the friction gear 17 or both held disengaged therefrom.

When the top base 4 is turned angularly on the sub-base 3, all of the parts comprising the derrick proper are turned with it, and the mast 1 is permitted to turn angularly with respect to the guy rope because of the sliding connection which the ring 8 has with the mast.

The invention having been described, what is claimed as new and useful is:

1. In a machine of the character described, a mast, a base on which the mast is mounted, a boom swingingly attached to the mast, a prime mover, hoisting ropes carried by the mast and the boom, operative connections between the prime mover and the hoisting rope, a main base upon which the first said base is mounted, the main base on its upper face and the first said base on its under face being formed with race-ways, balls carried in the race-ways to space the two said bases apart for the free turning movement of the first said base upon the main base, the said main base being formed with a marginal upturned rim, a friction gear engaging said rim, a vertically disposed shaft by which the friction gear is carried,

the said shaft having one end rotatably mounted on the first said base, a support in which the upper end of the shaft is journaled, a direction reversing gear operatively connected with said shaft, and connections between the prime mover and the said reversing gear whereby the first said base may be turned relative to the said main base for the purpose specified.

2. In a machine of the character described, a mast, a base on which the mast is mounted, a boom swingingly attached to the mast, a prime mover, hoisting ropes carried by the mast and the boom, operative connections between the prime mover and the hoisting rope, a main base upon which the first said base is mounted, the said main base being formed with a marginal upturned rim, a friction gear engaging said rim, a vertically disposed shaft by which the friction gear is carried, the said shaft having one end rotatably mounted on the first said base, a hub slidably mounted on said shaft but precluded from angular movement thereon, the said hub being formed with a beveled friction gear at each end, means for shift ing the hub longitudinally along the said shaft, a second shaft operatively connected with the prime mover, and a beveled friction gear carried by said second shaft and disposed for engagement with either of the friction gears carried by the first said shaft, whereby the first said shaft may be turned in either direction for shifting the first said base and all its parts in either direction around 011 the main base.

In testimony whereof I affix my signature.

HENRY A. CURTIS. 

